The graph of the line y = 4 is a a) vertical line with a slope of zero. b) horizontal line with a slope of zero. eliminate c) vertical line with an undefined slope. d) horizontal line with an undefined slope.

B) horizontal line with a slope of zero.

Step-by-step explanation:

∵ The equation of the type y = mx + c is always a straight line having the slope m,

Also,

Where,

= angle from the positive x-axis,

If m = 0, ⇒

i.e. line is parallel to x-axis or a horizontal line,

if m = ∞ ⇒

i.e. line is perpendicular to x-axis or vertical,

Here, the given line,

y = 4,

⇒ y = 0x + 4

By comparing,

m = 0,

⇒ It is a horizontal line with a slope of zero.

Hence, OPTION B is correct.

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step-by-step explanation: